Comey told reporters the law enforcement agency's internal review of the shooting of Ibragim Todashev in Florida is complete and will be released, "hopefully, very soon." The Justice Department and local prosecutors in Florida are continuing to investigate.

In the aftermath of the Boston Marathon bombings, Todashev told investigators that one of the brothers suspected in the explosions, Tamerlan Tsarnaev participated in a triple slaying in Waltham, Mass.

Three men were found at the scene of the crime with their necks slit and their bodies reportedly covered with marijuana. One victim was a boxer and friend of Tsarnaev.